<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>

  <form action="/pic/upload" enctype="multipart/form-data" method="post">
       <input type="text" name="username"><br>
       <input type="password" name="password"><br>
       <input type="file" name="pic"><br>
       <input type="submit" value="提交">
   </form>

</body>
</html>